Integrity testing of cast-in-situ concrete piles associated with the construction of New Haccho Bridge

摘要

Cast-in-situ concrete piles were constructed for the foundations of New Haccho Bridge at Komatsu City, Ishikawa Prefecture, Japan in 1997. The requirements for quality control during construction of the piles were the quantity of concrete used for each pile, the outer diameter of the casing pipe and the excavation length. For quality assessment of the concrete piles after hardening, Sonic Integrity Testing was conducted on a total of 8 piles of one abutment after curing periods of 17 to 28 days. Wave analysis of the Sonic Integrity Test signals showed that all the piles were constructed as designed. These signals will play the role of the reference signals, if a disaster such as a great earthquake should occur in the future. The reference signals would be compared with the Sonic Integrity Test signals that would be obtained after the disaster, in order to detect the occurrence of pile damage easily and quickly.